An ageless watchtower in Huercal-Overa, Spain recently received a rustic and <a href="http://inhabitat.com/genslers-green-sfo-terminal-renovation-to-be-completed-this-april/">sustainable renovation</a> that makes the old building accessible to visitors again. <a href="http://www.castillomiras.es/en/proyectos/torre-huercal-overa.html#">Castillo and Miras Arquitecturos</a> added a rustic <a href="http://inhabitat.com/beautiful-spanish-prefab-home-put-together-in-only-3-days/">cor-ten steel</a> staircase to the original stone tower, creating a glass-encased bridge. A small information center at the base of the building is made of the same material.

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Huercal-Overa Tower by Castillo Miras

This beautiful lookout tower needed an upgrade.

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Huercal-Overa Tower by Castillo Miras

But it was important not to disturb the existing site.

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Huercal-Overa tower by Castillo Miras

So the designers built a cor-ten spiral staircase next to the existing block building.

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Huercal-Overa tower by Castillo Miras

Nice and rustic, the staircase maintains the building's character.

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Huercal-Overa tower by Castillo Miras

The staircase is connected to the tower by way of a glass-covered bridge.

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Huercal-Overa tower by Castillo Miras

The steel contrasts with the stone without dominating it.

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Huercal-Overa tower by Castillo Miras

Actually, stone and steel look as though they belong together.

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Huercal-Overa tower by Castillo Miras

The spiral shape also contrasts with the block tower, bringing into relief the ageless character of existing building materials.

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Huercal-Overa tower by Castillo Miras

The designers worked around the topography to minimize ground works.

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Huercal-Overa tower by Castillo Miras

Roof Plan

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Huercal-Overa tower by Castillo Miras

Elevation plan.

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Huercal-Overa Tower by Castillo Miras

An ageless watchtower in Huercal-Overa, Spain recently received a rustic and sustainable renovation that makes the old building accessible to visitors again. Castillo and Miras Arquitecturos added a rustic cor-ten steel staircase to the original stone tower, creating a glass-encased bridge. A small information center at the base of the building is made of the same material.